To develop an IPM module against cotton leafhopper different tactics like, leafhopper resistant cultivar (KC 2) were integrated in different combinations and were evaluated. When the susceptible LRA 5166 was raised from imidacloprid treated seed with cluster bean intercrop and need based application of dimethoate 0.03 % leafhopper population was reduced by 79.01 per cent and seed cotton yield increased by 31.76 %. The pest reduction was 57.08 % with mere introduction of resistant cultivar viz., KC 2; the yield increase was 58.82 %. The yield increase was 125.88 % when the resistant cultivar KC 2 was raised from imidacloprid treated seeds, grown with cluster bean intercrop and applied with dimethoate on need basis.
A field experiment was carried out to study the effect of plant growth regulators on growth and yield of brinjal cv. ANNAMALAI. The growth regulators were applied in three different concentrations viz., NAA (25, 50 and 100 ppm), GA 3 (50, 100 and 200 ppm) and ethrel (50, 100 and 200 ppm). The experiment was laid out in Randomized Block Design (RBD) with ten treatments and three replications. The results of this experiment revealed that the plants that was sprayed with GA 3 @ 200 ppm evinced better performance for the production of plant height, number of primary branches, number of secondary branches, number of leaves, leaf area and leaf area index.
A field experiment was carried out to study the effect of plant growth regulators on growth and yield of brinjal cv. ANNAMALAI. The growth regulators were applied in three different concentrations viz., NAA (25, 50 and 100 ppm), GA 3 (50, 100 and 200 ppm) and ethrel (50, 100 and 200 ppm). The experiment was laid out in Randomized Block Design (RBD) with ten treatments and three replications. The earliness in flowering, number of flowers, fruit set percentage, fruit length, fruit girth, fruit weight and yield per plant were registered in the plants sprayed with GA 3 @ 50 ppm. The fruits obtained from the plants that were sprayed with GA 3 @ 200 ppm also recorded highest total soluble solids and ascorbic acid content, which ultimately had better taste than the other treatments. Among the growth regulators tested, GA 3 @ 50 ppm was found to produce best results in improving the growth and yield of brinjal cv. ANNAMALAI.
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